| 辛亚男,张建文,姜爱国.一种新型螺旋内槽管的气液固三相流数值模拟研究[J].计算力学学报,2018,35(2):238~248 |
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| 一种新型螺旋内槽管的气液固三相流数值模拟研究 |
| Numerical simulation of gas-liquid-solid flow in a new internal spiral-grooved tube |
| 投稿时间：2017-01-16 修订日期：2017-03-30 |
| DOI：10.7511/jslx20170116004 |
| 中文关键词: 计算流体力学 三流体模型 颗粒动力学 螺旋内槽管 |
| 英文关键词:CFD three-fluid model KTGF internal spiral-grooved tube |
| 基金项目:国家科技支撑计划项目（2015BAK39B02）资助项目. |
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| 摘要点击次数: 1550 |
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| 中文摘要: |
| 针对一种新型螺旋内槽管，采用先进的计算流体力学（CFD）数值模拟方法，对管内的气（天然气）-液（水）-固（水合物）三相流流动特性进行了模拟研究。模型采用欧拉-欧拉-欧拉三流体模型结合颗粒动力学的理论，考察了不同的表观速度（0.3 m/s，0.5 m/s，0.7 m/s），水合物粒径（500 μm，750 μm，1000 μm），气泡大小（10 μm，100 μm，1000 μm），螺距（400 mm，800 mm），螺纹头数（12，20）及螺纹旋向对于管内三相流动特性的影响。通过数值计算，由于气液固三相间的密度差，在螺旋内槽的作用下，水合物和天然气在管中心位置聚集，同时管壁处的含量减小。流体表观流速和气泡越大，壁面处的水合物和天然气的体积分数越小；由于天然气的密度小于水合物和水的密度，天然气更多集中在管中心，越靠近管壁含量越少；颗粒的粒径越大，壁面处的水合物含量越少，而对于天然气的分布则影响不大；螺距越小，螺纹头数越多，螺旋流强度越大，气液固三相分离效果越好，壁面处的水合物和天然气的含量越小；同时，螺纹旋向的改变对于三相的分离效果影响较小。 |
| 英文摘要: |
| A computational fluid dynamics (CFD) modeling of gas(natural gas)-liquid(water)-solid (hydrate) flow in a new internal spiral-grooved tube is presented.The effects of superficial velocity(0.3 m/s,0.5 m/s,and 0.7 m/s),the particle size(500 μm,750 μm,and 1000 μm),bubble size(10 μm,100 μm,and 1000 μm),the pitch(400 mm,800 mm),thread head number(12,20)and spiral direction on the flow features of the new spiral-grooved tube using the Eulerian-Eulerian-Eulerian method with the kinetic theory of granular flow(KTGF)are systematically studied.Numerical simulation results show that because of the internal spiral grooves and the density difference among liquid,solid particle and gas,solid and gas accumulate to the center of tube and the concentration decreases near the wall.The larger velocity and bubble size are,the smaller the concentrations of hydrate and natural gas near the wall are;because the density of natural gas is the smallest,natural gas is more concentrated in the center and the closer to the wall,and the less content is.The larger particle size is,the smaller the solid volume fraction near the wall is,while lower influence on the distribution of natural gas.With the decrease of pitch and increase of the number of thread heads,the intensity of spiral fluid increases,and the separation effect of gas-liquid-solid three-phase is enhanced.Furthermore,the content of hydrate and natural gas near the wall is reduced.The results indicate that the separation effect of gas-liquid-solid three-phase is not sensitive to the change of spiral direction as well. |
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